Dog ball



FIG. 1 is a front elevational view of a dog ball, showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines in the drawings depict a portion of the dog ball thatforms no part of the claimed design.

CLAIM The ornamental design for a dog ball, as shown and described.